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As you can see, the first two settings are for luma. Of those two, I change only the first one and leave the second one at "let madVR decide". The third setting is for chroma, and that is also best left at "let madVR decide", unless you have plenty of headroom to mess with chroma settings. In the madVR OSD you can find that chroma setting in the third upscaling line, underneath luma. Looking at your screenshot, I would also leave the rest of the settings at "let madVR decide", unless you feel the need to tweak something in particular.